For every $1000.00 put down the difference in payment per month is $6-$10. You might be already on to that. Not having to pay the PMI will save you much more over 15-30 year on the loan. For me, I took the no PMI option with 20% down. That is money just lost to some non-entity. I would prefer to put the money into the home via larger down payment. I'm only paying myself back and not giving it to this guy...